| Summary: | The article gives a comparative aspect of the organism development periodization, depending on the gender and age of the fetus. It was established that in the individual development of animals, there is a specific biological regularity of periodicity. It is indicated by the unequal growth of individual organs and the organism as a whole at different stages of ontogenesis, age-related features in the growth of individual parts and proportions of the body, as well as changes in the requirements of a growing organism to living conditions. At different stages of animal embryogenesis, there is a rather short period of a sharp increase in metabolism, as well as the intensity and usefulness of self-renewal, which to some extent, is an indicator of the growth rate of the fetus depending on gender. Pituitary and serum gonadotropins were used to induce ovulation of cows. As a result, in the group where pituitary gonadotropin was used, 87.5% of cows with pregnancy of 91.7% showed desire, 75% of serum gonadotropin with 87.5% of pregnancy. An analysis of the obtained data shows that in the second stage of embryonic development, the intensity of the formation of internal organs slows down, while the intensity of increasing the live weight of the fetus increases, regardless of groups.
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